JPWO2016117231A1 - Seat belt tongue and seat belt device - Google Patents

Abstract

An anti-slip member (35) having a protrusion (36) at the tip of which the webbing slip prevention means (30) protrudes toward the webbing (W) at an emergency, and a cover member that accommodates the anti-slip member (35) at the normal time (31) and a pair of guide members (42) that are pushed by the webbing (W) in an emergency and project the protrusion (36) from the cover member (31). Accordingly, there is provided a seat belt tongue and a seat belt device that can pull out the webbing without resistance at normal times and can effectively restrain the withdrawal of the webbing in an emergency to reliably restrain the occupant.

Description

  The present invention relates to a seat belt tongue and a seat belt device, and more particularly to a seat belt tongue and a seat belt device that can further improve the restraint of an occupant in an emergency.

  Conventionally, after an emergency lock mechanism of a seat belt retractor is activated in an emergency, the seat belt slightly extends due to the inertia force of the occupant, and the occupant moves slightly forward. For this reason, a tongue and a seat belt device using the tongue that prevent a reduction in the restraining performance of the occupant due to the extension of the seat belt have been disclosed (for example, see Patent Documents 1, 2, and 3). The tongues described in Patent Documents 1, 2, and 3 are provided with a recess on the seat belt sliding surface of the seat belt sliding member, and a predetermined number of protrusions are independently provided in the recess in a dotted manner. The seat belt can be smoothly slid on the sliding surface, and in the event of an emergency, the seat belt is bitten into the protrusions to suppress the extension of the seat belt, thereby improving the restraint of the occupant by the seat belt.

Japanese Unexamined Patent Publication No. 2012-71640 Japanese Unexamined Patent Publication No. 2013-6584 Japanese Unexamined Patent Publication No. 2013-173424

  However, since the tongue disclosed in Patent Documents 1, 2, and 3 and the seat belt device using the tongue are always in contact with the seat belt, there is a concern about the wear resistance of the seat belt. Further, there is a limit to the size of the protrusion that can be formed by being exposed on the surface of the tongue, and the sliding resistance with the seat belt cannot always be made sufficiently large. Further, the protrusions are exposed on the surface of the tongue, so that the appearance does not look good and there is room for improvement.

  The present invention has been made in view of the above-described problems, and its purpose is to be able to pull out the webbing without resistance in normal times, and to effectively restrain the occupant by effectively suppressing the withdrawal of the webbing in an emergency. It is an object of the present invention to provide a seat belt tongue and a seat belt device that can be used.

The above object of the present invention can be achieved by the following constitution.
(1) a tongue main body having an engaging portion engageable with the buckle and having a webbing insertion hole through which the webbing is inserted;
Webbing slip prevention means provided on the tongue main body on the opposite side of the engagement portion with respect to the webbing insertion hole;
A seat belt tongue having
The webbing slip prevention means includes
An anti-slip member that protrudes in an emergency toward the webbing inserted through the webbing insertion hole and has a protrusion at the tip that blocks the movement of the webbing,
A cover member for accommodating the anti-slip member at normal time;
An operation member that protrudes from the tongue main body in a normal state and is pushed in by the webbing in an emergency to protrude the protrusion of the anti-slip member from the cover member;
A seatbelt tongue comprising:
(2) The moving direction of the operation member and the moving direction of the anti-slip member are substantially orthogonal to each other,
The operation member and the anti-slip member are respectively provided with inclined cam surfaces that are inclined with respect to the moving direction of the operating member and the moving direction of the anti-slip member and are in contact with each other so as to be slidable.
In an emergency, the webbing exerts a force on the operation member, and the operation member is pushed in, so that the protrusion of the slip prevention member is pushed out of the cover member by the inclined cam surface and protrudes toward the webbing, The seat belt tongue according to (1), wherein movement of the webbing relative to the anti-slip member is suppressed.
(3) The operation member has a pair of guide members each having the inclined cam surface and capable of coming into contact with the webbing and moving in a direction approaching or separating from each other. Seat belt tongue.
(4) The seat belt tongue according to any one of (1) to (3), wherein the cover member has a hole for projecting the protrusion in an emergency.
(5) The cover member covers a surface into which the operation member is pushed by the webbing in an emergency,
The seat belt tongue according to any one of (1) to (4), wherein the cover member is elastically deformed when the operation member is pushed in by the webbing in an emergency.
(6) The seat belt tongue according to any one of (1) to (5), wherein the cover member is movable in a direction opposite to a movement direction of the slip prevention member.
(7) a tongue main body having an engaging portion engageable with the buckle and having a webbing insertion hole through which the webbing is inserted;
Webbing slip prevention means provided on the tongue main body on the opposite side of the engagement portion with respect to the webbing insertion hole;
A seat belt tongue having
The webbing slip prevention means includes
An anti-slip member having a protrusion at the tip that bites into the webbing inserted into the webbing insertion hole in an emergency and prevents movement of the webbing;
A cover member that accommodates the anti-slip member at a normal time to prevent contact between the protrusion and the webbing;
An operation member that protrudes from the cover member in a normal state and is pushed by the webbing in an emergency to project the protrusion of the anti-slip member from the cover member;
A seatbelt tongue comprising:
(8) A seat belt apparatus comprising the seat belt tongue according to any one of (1) to (7).

  According to the seatbelt tongue of the present invention, the webbing slip prevention means is pushed by the webbing in an emergency, the slip prevention member having a protrusion protruding toward the webbing in an emergency, the cover member that accommodates the slip prevention member in a normal time And an operating member for projecting the protruding portion from the cover member. The webbing slip prevention means prevents the movement of the webbing by projecting the protrusion toward the webbing in an emergency, and thus effectively restrains the withdrawal of the webbing in an emergency and ensures the safety of the passenger by ensuring restraint. be able to. In addition, the webbing can be pulled out without resistance during normal operation, improving operability.

It is a top view of the seatbelt tongue which concerns on this invention. (A) is the sectional view on the AA line of FIG. 1 which shows the normal state in which the slip prevention member was accommodated in the cover member, (b) is an anti-slip member protruding by webbing, and a projection part becomes webbing. It is the sectional view on the AA line of FIG. 1 which shows the state in which the emergency was taken in, (c) is a perspective view of one (right side of FIG. 2 (a)) guide member. (A) is the sectional view on the AA line of FIG. 1 which shows the normal state of the seatbelt tongue which concerns on the modification of this invention, (b) is A- of FIG. 1 which shows the state in emergency. It is A sectional view.

  Hereinafter, an embodiment of a seat belt tongue according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the seat belt tongue 10 includes a tongue body 20 and webbing slip prevention means 30 disposed on the tongue body 20. The tongue main body 20 includes a metal tongue plate 22 and a grip portion 23 that partially covers the tongue plate 22 and has a webbing insertion hole 24 through which the webbing W is inserted. The tongue main body 20 is formed in a substantially T-shaped plate shape in plan view in which the grip portion 23 is slightly thick.

  The tongue plate 22 is formed with a substantially rectangular opening 26 as an engaging portion in a flat portion as the buckle insertion portion 25. The buckle insertion part 25 is inserted into a buckle (not shown) fixed to the vehicle, and the opening 26 engages with a lock element (not shown) provided inside the buckle.

  The grip portion 23 has an elongated webbing insertion hole 24 through which the webbing W is inserted, and is formed integrally with, for example, a synthetic resin so as to cover a part of the tongue plate 22 (upper part in FIG. 1). The gripping part 23 is gripped and operated when the buckle insertion part 25 of the tongue plate 22 is inserted into the buckle and the opening 26 is engaged with the lock element.

  The webbing slip prevention means 30 includes a cover member 31, a slip prevention member 35 having a plurality of protrusions 36 at the tip, and a pair of guide members (operation members) 42, and a tongue plate with respect to the webbing insertion hole 24. On the opposite side of the 22 buckle insertion portion 25, the grip portion 23 is disposed.

  The cover member 31 is formed in a bowl shape having a substantially semicircular cross section, and is fixed to one side edge on the opposite side to the buckle insertion portion 25 of the tongue plate 22 among both side edges along the longitudinal direction of the webbing insertion hole 24. Has been. Thus, a space S that can accommodate the slip prevention member 35 and the pair of guide members 42 is formed inside the cover member 31 along one side edge of the webbing insertion hole 24.

  In the cover member 31, a plurality of holes 32 for projecting the protrusions 36 of the slip prevention member 35 are formed along the longitudinal direction of the webbing insertion hole 24.

  The anti-slip member 35 is a deformed rod-shaped member disposed in the space S of the cover member 31 along the longitudinal direction of the webbing insertion hole 24, and has a plurality of protrusions 36 at the tip in the cross-sectional view shown in FIG. In addition, inclined cam surfaces 37 are formed on the left and right rear side surfaces.

  The plurality of protrusions 36 are formed in a conical shape independently of each other, and are formed to be able to advance and retract from the plurality of slits 32 of the cover member 31. The tip of each conical protrusion 36 is rounded to prevent damage to the webbing W when it bites into the webbing W.

  The inclined cam surface 37 is formed to be inclined (for example, 45 °) with respect to the moving direction (arrow A direction) of a slip prevention member 35 described later.

  The pair of guide members 42 are disposed on both sides of the anti-slip member 35, and an inclined cam surface 43 is formed on one end surface on the anti-slip member 35 side, and the other end surface 44 is fitted on the tongue body 20, that is, fitted. It protrudes from the elongated hole 27 to the outside of the grip portion 23. The long hole 27 is a slit-like hole formed in the grip portion 23 along the longitudinal direction of the webbing insertion hole 24. Accordingly, the pair of guide members 42 protrude outward from the cover member 31 in a normal state.

  Each guide member 42 has a locking projection 45 on the end face in the longitudinal direction. The locking projection 45 is slidably fitted into a slit-shaped locking hole 29 formed in the side wall 28 that defines the left and right end surfaces of the long hole 27. The pair of guide members 42 are prevented from falling out of the long holes 27 when the locking projections 45 are fitted into the slit-shaped locking holes 29. It should be noted that the pair of guide members 42 is not limited to the configuration in which the engagement protrusion 45 and the slit-shaped engagement hole 29 are fitted to each other as long as the pair of guide members 42 are movably held in the long hole 27. Absent.

  The pair of guide members 42 are guided by the slit-like locking holes 29 into which the locking projections 45 are fitted, and are movable in directions close to or away from each other (in the left-right direction in FIG. 2). The movement direction (arrow B direction) of the pair of guide members 42 is substantially orthogonal to the movement direction (arrow A direction) of the anti-slip member 35. The inclined cam surface 43 has substantially the same inclination angle (for example, 45 °) as the inclined cam surface 37 of the anti-slip member 35 and slidably contacts the inclined cam surface 37 of the anti-slip member 35.

  The webbing slip prevention means 30 is preferably provided with an elastic member (not shown) that urges the slip prevention member 35 in the direction opposite to the arrow A direction. As a result, the projection 36 of the anti-slip member 35 is stably housed inside the cover member 31 at the normal time, and the other end surfaces 44 of the pair of guide members 42 are moved by the action of the inclined cam surfaces 37 and 43. It is maintained in a state (see FIG. 2A) protruding outward from the gripping portion 23.

  Next, the operation of this embodiment will be described. At normal times when no tension is applied to the webbing W, as shown in FIG. 2A, the anti-slip member 35 is pressed in the direction opposite to the arrow A direction by an elastic member (not shown) to cover the protrusion 36 together with the protrusion 36. The member 31 is accommodated inside. For this reason, the webbing W is prevented from coming into contact with the protrusion 36, and can be drawn out freely without resistance by being guided by the arcuate outer peripheral surface of the cover member 31, and good operability is maintained. At this time, the pair of guide members 42 are in a state in which the other end surface 44 protrudes outward from the grip portion 23 by the action of the inclined cam surfaces 37 and 43.

  In an emergency, a seat belt retractor (not shown) winds up the webbing W by a pretensioner and then locks the drawer of the webbing W to restrain the occupant. Thereafter, when the occupant moves forward due to inertia, the webbing W is pulled and a large tension acts on the webbing W. For this reason, the webbing W inserted through the webbing insertion hole 24 so as to be folded back presses the pair of guide members 42 in a direction approaching each other (arrow B direction) to bring the pair of guide members 42 into the grip portion 23. Push in.

  As a result, as shown in FIG. 2B, the slip prevention member 35 in which the inclined cam surface 37 is slidably contacted with the inclined cam surface 43 of the guide member 42 is Moving in the A direction, the protrusion 36 protrudes from the slit 32 of the cover member 31 toward the webbing W and bites into the webbing W. Thereby, sliding resistance with webbing W becomes large, the movement of webbing W is prevented, and a crew member is restrained more certainly and firmly.

  According to the seat belt tongue 10 of the present embodiment and the seat belt device including the seat belt tongue 10, the webbing slip preventing means 30 has a protrusion 36 that protrudes toward the webbing W at the tip and bites into the webbing W. An anti-slip member 35, a cover member 31 that accommodates the anti-slip member 35 in a normal state to prevent the protrusion 36 from contacting the webbing W, and the protrusion 36 that is pushed by the webbing W in an emergency is removed from the cover member 31. A pair of guide members 42 to be projected. The webbing slip prevention means 30 projects the protrusion 36 toward the webbing W in an emergency, and prevents the webbing W from moving by biting the webbing W, so that the webbing W can be effectively prevented from being pulled out in an emergency. The passenger can be securely restrained to ensure safety. In addition, the webbing W can be pulled out without resistance during normal operation, improving operability.

  In addition, the pair of guide members 42 and the anti-slip member 35 whose movement directions are orthogonal to each other are in contact with each other via inclined cam surfaces 43 and 37 that are inclined with respect to the respective movement directions. In an emergency, the webbing W exerts a force on the pair of guide members 42 and the pair of guide members 42 are pushed in, so that the protrusions 36 of the anti-slip member 35 are removed from the cover member 31 by the action of the inclined cam surfaces 43 and 37. Since it pushes out and bites into the webbing W, the occupant can be reliably restrained in an emergency. Further, since the protrusion amount of the protrusion 36 from the cover member 31 is substantially proportional to the tension acting on the webbing W, a frictional resistance force that is approximately proportional to the magnitude of the tension acting on the webbing W is applied to the webbing W. It is possible to prevent the movement of the webbing W by being provided.

  Further, the cover member 31 has a slit 32 for projecting the protruding portion 36 in an emergency, and the slip prevention member 35 is accommodated in the normal state, so that the webbing W can be smoothly slid and looks good. And the product value is enhanced.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, the cover member 31 is not limited to the plurality of holes 32, but may be formed with an opening through which the protrusion 36 can advance and retract according to the shape of the protrusion 36 of the slip prevention member 35, such as a slit.
In the present embodiment, the operation member of the present invention is a pair of guide members 42, 42. However, in an emergency, the operation member is pushed by the webbing W so that the protrusion 36 of the anti-slip member 35 protrudes from the cover member 31. If there is, it is not limited to this. For example, the operation member may be configured to be pushed into the webbing insertion hole 24 by either the shoulder belt side or the lap belt side webbing W.

  FIG. 3 shows a seat belt tongue according to a modification of the present invention. In this modification, the cover member 31 covers the other end face 44 of each guide member 42 and is formed so as to be elastically deformable so that the cover member 31 and the guide member 42 are pushed together by the webbing W. Further, the other end surface 44 of the guide member 42 is inclined or curved corresponding to the shape of the cover member 31. Thereby, the external appearance property of the seatbelt tongue 10 and the retainability of the guide member 42 can be improved.

  Further, as in the modification of FIG. 3, the cover member 31 may also be configured to be movable in the direction opposite to the movement direction (arrow A direction) of the anti-slip member 35. Accordingly, the protrusion 36 can be advanced and retracted from the hole 32 without increasing the movement stroke of the pair of guide members 42, and a compact design can be performed.

  Further, bent portions 31a are provided at both ends in the bending direction of the cover member 31, and in a normal state, the cover member 31 and each guide member 42 are engaged with the corner portions of each guide member 42. What is necessary is just to position each other.

  This application is based on Japanese Patent Application No. 2015-008517 filed on January 20, 2015, the contents of which are incorporated herein by reference.

10 seat belt tongue 20 tongue body 22 tongue plate 23 gripping portion 24 webbing insertion hole 26 opening (engagement portion)
30 Webbing slip prevention means 31 Cover member 32 Slit (hole)
35 Anti-slip member 36 Projection 37, 43 Inclined cam surface 42 Guide member (operation member)
W Webbing

Claims (8)

A tongue body having an engaging portion engageable with the buckle and having a webbing insertion hole through which the webbing is inserted;
Webbing slip prevention means provided on the tongue main body on the opposite side of the engagement portion with respect to the webbing insertion hole;
A seat belt tongue having
The webbing slip prevention means includes
An anti-slip member that protrudes in an emergency toward the webbing inserted through the webbing insertion hole and has a protrusion at the tip that blocks the movement of the webbing,
A cover member for accommodating the anti-slip member at normal time;
An operation member that protrudes from the tongue main body in a normal state and is pushed in by the webbing in an emergency to protrude the protrusion of the anti-slip member from the cover member;
A seatbelt tongue comprising: The moving direction of the operating member and the moving direction of the anti-slip member are substantially orthogonal,
The operation member and the anti-slip member are respectively provided with inclined cam surfaces that are inclined with respect to the moving direction of the operating member and the moving direction of the anti-slip member and are in contact with each other so as to be slidable.
In an emergency, the webbing exerts a force on the operation member, and the operation member is pushed in, so that the protrusion of the slip prevention member is pushed out of the cover member by the inclined cam surface and protrudes toward the webbing, The seat belt tongue according to claim 1, wherein movement of the webbing relative to the anti-slip member is suppressed.   3. The seat belt according to claim 2, wherein each of the operation members has a pair of guide members that have the inclined cam surfaces and that can contact the webbing and move toward or away from each other. Tongue.   The seat belt tongue according to any one of claims 1 to 3, wherein the cover member has a hole for projecting the protrusion in an emergency. The cover member covers a surface into which the operation member is pushed by the webbing in an emergency.
The seat belt tongue according to any one of claims 1 to 4, wherein the cover member is elastically deformed when the operation member is pushed in by the webbing in an emergency.   The seat belt tongue according to any one of claims 1 to 5, wherein the cover member is movable in a direction opposite to a moving direction of the anti-slip member. A tongue body having an engaging portion engageable with the buckle and having a webbing insertion hole through which the webbing is inserted;
Webbing slip prevention means provided on the tongue main body on the opposite side of the engagement portion with respect to the webbing insertion hole;
A seat belt tongue having
The webbing slip prevention means includes
An anti-slip member having a protrusion at the tip that bites into the webbing inserted into the webbing insertion hole in an emergency and prevents movement of the webbing;
A cover member that accommodates the anti-slip member at a normal time to prevent contact between the protrusion and the webbing;
An operation member that protrudes from the cover member in a normal state and is pushed by the webbing in an emergency to project the protrusion of the anti-slip member from the cover member;
A seatbelt tongue comprising:   A seat belt device comprising the seat belt tongue according to any one of claims 1 to 7.

Images